JP6063299B2 - Disc brake - Google Patents

Description

  The present invention relates to a disc brake that applies a braking force to a vehicle such as an automobile.

  In general, a disc brake provided in a vehicle such as an automobile is attached to a non-rotating portion of the vehicle across the disc and has a mounting member having a pad guide formed as a concave groove recessed in the rotating direction of the disc, and the mounting member A caliper provided so as to be slidable, a friction pad which is slidably fitted to the pad guide, is formed extending at both ends in the circumferential direction of the disc, and a friction pad which is pressed against the disc by the caliper, and a pad guide The friction pad is slid, the pad spring for urging the friction pad radially outward of the disk, the base end side is fixed to the friction pad, and the tip end side is disposed opposite the mounting member side. And a return spring that urges the friction pad in a return direction away from the disk (see, for example, Patent Document 1).

  When a driver or the like of a vehicle performs a braking operation, for example, the piston of the caliper is slid and displaced toward the disk side by supplying hydraulic pressure from the outside, and the friction pad is pressed toward the disk by the piston. A braking force is applied to the disc. On the other hand, when the brake operation is released, the hydraulic pressure supply to the piston is stopped, and the friction pad is returned to the return position separated from the disk by the return spring.

JP 2009-41769 A

  In the case of the above-described prior art, the return spring is fixed to the friction pad at one location. In sliding the friction pad, the friction pad is separated from the disk due to the difference with the change of the friction coefficient with time of the contact surface between the friction pad fitting portion and the pad spring in the radial direction of the disk. In the process, the friction pad may be inclined with respect to the pressed surface of the disk. In this case, since the return spring is fixed at one location, the inclination of the friction pad cannot be suppressed, and the sliding resistance increases between the fitting portion of the friction pad and the pad spring. There is a possibility that the separation from the disk is insufficient and the drag cannot be suppressed.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to provide a disc brake capable of suppressing the tilt of the friction pad with respect to the pressed surface of the disc in the process of separating the friction pad from the disc. It is to provide.

  In order to solve the above-described problems, the present invention provides a mounting member having a pad guide formed as a concave groove that is mounted on a non-rotating portion of a vehicle across a disk and is recessed in the rotating direction of the disk, and slides on the mounting member. A caliper that can be provided, and a friction pad that is slidably fitted to the pad guide and extends at both ends in the circumferential direction of the disc, and a friction pad that is pressed against the disc by the caliper, A pad spring attached to the pad guide for sliding the fitting portion of the friction pad and urging the friction pad outward in the radial direction of the disk; a proximal end side fixed to the friction pad; Suitable for a disc brake provided with a return spring disposed opposite to the mounting member and biasing the friction pad in a return direction away from the disc. It is.

The feature of the configuration to which the present invention is employed, the return spring is branched into a plurality at the base end side, and have contact to the branched proximally disk radial direction fixing portion to said friction pad The configuration is such that a plurality are provided at intervals.

  According to the present invention, it is possible to suppress the inclination of the friction pad with respect to the pressed surface of the disk in the process of separating the friction pad from the disk.

It is the top view which looked at the disc brake by a 1st embodiment from the upper part (disc radial direction outside). It is the front view which looked at the disc brake from the outer side. FIG. 3 is a cross-sectional view of the disc brake as seen from the III-III direction in FIG. 2. FIG. 4 is an enlarged view corresponding to a (IV) portion in FIG. 2 with the caliper removed. It is the top view which looked at the attachment member, the friction pad, the pad spring, the return spring, etc. from the VV direction in FIG. FIG. 3 is a front view of an outer side friction pad, a return spring, and the like viewed from the same direction as FIG. 2. It is a perspective view which shows a return spring alone. It is a front view of the same position as Drawing 6 showing the return spring by a 2nd embodiment with a friction pad etc. It is a perspective view which shows a return spring alone.

  Hereinafter, disk brakes according to embodiments will be described in detail with reference to the accompanying drawings.

  1 to 7 show a first embodiment. A disk 1 (see FIGS. 2 and 3) that rotates with wheels (not shown) rotates in the direction of arrow A (see FIG. 2), for example, when the vehicle travels in the forward direction, and when the vehicle moves backward. It rotates in the direction indicated by arrow B (see FIG. 2).

  An attachment member 2 called a carrier is attached to a non-rotating part (not shown) of the vehicle across the outer peripheral side of the disk 1. Here, the attachment member 2 is roughly constituted by a pair of arm portions 2A, 2A, a support portion 2B, and a reinforcing beam 2C. The arms 2A and 2A are separated from each other in the rotation direction of the disk 1 (left and right directions in FIGS. 1 and 2, the front and back directions in FIG. 3, and in this application, the disk rotation direction and the disk circumferential direction). It extends in the axial direction of the disk 1 (the upper and lower directions in FIG. 1, the front and back directions in FIG. 2, the left and right directions in FIG. 3, and in this application, the disk axial direction) so as to straddle the outer periphery of the disk 1 ing.

  The support portion 2B is provided so as to be integrated with the base end side of each arm portion 2A, and is fixed to the non-rotating portion of the vehicle at a position on the inner side of the disc 1. The reinforcing beam 2 </ b> C connects the distal ends of the arms 2 </ b> A to each other at a position on the outer side of the disk 1. Thereby, each arm part 2A of the attachment member 2 is integrally connected by the support part 2B on the inner side of the disk 1, and is integrally connected by the reinforcing beam 2C on the outer side.

  A disc path portion (not shown) extending in an arc along the outer periphery (rotation locus) of the disc 1 is formed in the intermediate portion in the disc axial direction of each arm portion 2A of the mounting member 2. Inner side and outer side pad guides 3 are respectively formed on both sides of the disc path portion of the mounting member 2 (both sides in the disc axial direction). In other words, the mounting member 2 has the pad guides 3 on both the inner side and the outer side at both side positions in the disk circumferential direction. Each of these pad guides 3 is formed as a U-shaped concave groove as a whole that is recessed in the disk rotation direction, and extends in a direction in which a friction pad 6 described later slides, that is, in the disk axial direction.

  Each pad guide 3 guides the friction pad 6 in the disk axial direction via the ears 7B and 7C of the back plate 7 constituting the friction pad 6. For this purpose, each pad guide 3 has ears 7B and 7C of the friction pad 6 (back plate 7) in the radial direction of the disk 1 (the front and back directions in FIG. 1, the upper and lower sides in FIGS. 2 and 3). Direction (referred to as the disk radial direction in the present application). That is, as shown in FIG. 4, the pad guide 3 has an outer diameter side wall surface 3 </ b> A located on the radially outer side of the disk 1 and an inner diameter side wall surface 3 </ b> B located on the radially inner side of the disk 1, The ear portions 7B and 7C of the friction pad 6 are sandwiched between the outer diameter side wall surface 3A and the inner diameter side wall surface 3B in the disk radial direction. Thereby, the pad guide 3 guides the friction pad 6 in the axial direction of the disk 1 via a guide plate portion 13A of the pad spring 13 described later.

  The back side wall surface of the pad guide 3, that is, the back side wall surface that connects the outer diameter side wall surface 3 </ b> A and the inner diameter side wall surface 3 </ b> B on the back side constitutes a torque receiving surface 4 as a so-called torque receiving portion. Is. The torque receiving surface 4 receives the braking torque that the friction pad 6 receives from the disk 1 during brake operation via the ear portions 7B and 7C of the friction pad 6 and the guide plate portion 13A of the pad spring 13.

  The mounting member 2 is provided with a caliper 5 that is slidable (movable) in the disk axial direction. The caliper 5 is roughly constituted by an inner leg portion 5A, a bridge portion 5B, an outer leg portion 5C, a cylinder 5D, a piston 5E, and an attachment portion 5F. The inner leg 5 </ b> A is provided on the inner side which is one side in the axial direction of the disk 1. The bridge portion 5 </ b> B extends from the inner leg portion 5 </ b> A to the outer side, which is the other side in the axial direction of the disc 1, so as to straddle the outer peripheral side of the disc 1 between the arm portions 2 </ b> A of the mounting member 2. The outer leg portion 5C extends inward in the radial direction of the disk from the outer side, which is the distal end side of the bridge portion 5B, and has a plurality of claw portions 5C1 on the distal end side.

  The inner leg 5A of the caliper 5 is provided with, for example, two cylinders 5D (only one is shown in FIG. 3) that are twin bores arranged in the disk rotation direction. In each cylinder 5D, a piston 5E (only one is shown in FIG. 3) is slidably inserted. As shown in FIGS. 1 and 2, the inner leg portion 5A is integrally provided with a pair of attachment portions 5F and 5F protruding in the disc rotation direction. Each of these attachment portions 5F, 5F supports the entire caliper 5 to be slidable on each arm portion 2A of the attachment member 2 via a slide pin (not shown).

  The inner side and outer side friction pads 6, 6 are arranged to face both side surfaces of the disk 1 in the axial direction. Each friction pad 6 is attached to the attachment member 2 so as to be movable in the disk axial direction, and is pressed against both surfaces of the disk 1 by the caliper 5. Here, as shown in FIGS. 4 to 6, each friction pad 6 is joined (adhered) to a flat plate 7 extending in the disc rotation direction and a disc facing surface 7 </ b> A among the surfaces of the back plate 7. It is generally constituted by a lining 8 as a friction material that is in frictional contact with the surface (side surface in the axial direction) of the disk 1. The back plate 7 can be formed of metal, resin, or the like.

  The back plate 7 of the friction pad 6 is formed with ear portions 7B and 7C as fitting portions located at both ends in the circumferential direction of the disc and extending in the circumferential direction of the disc. These ear portions 7B and 7C are slidably fitted (inserted) into the pad guide 3 of the mounting member 2 via respective guide plate portions 13A of the pad spring 13 described later. And each ear | edge part 7B, 7C transmits the braking torque which the friction pad 6 receives from the disk 1 at the time of brake operation of a vehicle to the torque receiving surface 4 of the attachment member 2 (via the pad spring 13). It constitutes.

  The ear portions 7B and 7C of the friction pad 6 (back plate 7) are formed symmetrically to the left and right and have the same convex shape. Here, one of the ears 7B (on the right side of FIGS. 2 and 6) is arranged on the rotation direction entrance side (turn-in side) of the disk 1 that rotates in the direction of arrow A when the vehicle moves forward, and the other (FIG. 2). 2 and (left side in FIG. 6) are arranged on the rotation direction outlet side (outward side) of the disk 1. A return spring 14 to be described later is attached in the vicinity of one of the ears 7B located on the side of the disk 1 on the back plate 7 of the friction pad 6. In the present embodiment, the return spring 14 is provided only on the turn-in side of the disk 1 and is not provided on the turn-out side. However, it may be provided on the delivery side as required.

  As shown in FIG. 6, the ear portions 7B and 7C include outer facing surfaces 7B1 and 7C1 that face the outer diameter side wall surface 3A of the pad guide 3, and inner facing surfaces 7B2 that face the inner diameter side wall surface 3B of the pad guide 3. 7C2 and three opposite surfaces 7B3 and 7C3 facing the torque receiving surface 4 which is the back side wall surface of the pad guide 3. The ear portions 7B and 7C are formed in a substantially U-shaped convex shape by three surfaces of the outer facing surfaces 7B1 and 7C1, the inner facing surfaces 7B2 and 7C2, and the circumferential facing surfaces 7B3 and 7C3.

  In this case, if the line connecting the central portions of the ear portions 7B and 7C in the disk radial direction is the center line XX, the outer facing surfaces 7B1 and 7C1 are located on the outer side in the disk radial direction than the center line XX. It faces the pad guide 3 (the outer diameter side wall surface 3A thereof) in the disk radial direction. The inner facing surfaces 7B2 and 7C2 are positioned on the inner side in the disk radial direction with respect to the center line XX and face the pad guide 3 (the inner diameter side wall surface 3B) in the disk radial direction. The circumferentially opposed surfaces 7B3 and 7C3 are arranged so as to be orthogonal to the center line XX and face the pad guide 3 (torque receiving surface 4 thereof) in the disk circumferential direction.

  The back plate 7 of the friction pad 6 is provided with a pair of protrusions 9 positioned in the vicinity of the ear portion 7B on the entry side, and provided with a pair of protrusions 10 in the vicinity of the ear portion 7C on the outlet side. It has been. Each of these protrusions 9 and 10 is provided so as to protrude on the back surface 7D (surface opposite to the disk facing surface 7A on which the lining 8 is provided, the back surface) side of the back plate 7, and the cross-sectional shape thereof is It is formed in a non-circular shape (for example, an oval shape or an oval shape). One of the protrusions 9 and 10, which is positioned on the side of the disk 1, is for fixing a base end side of a return spring 14 to be described later to the back plate 7. That is, the caulking hole 14 </ b> A <b> 3 of the return spring 14 is engaged with (engaged by caulking) one protrusion (turn-in side) 9.

  Here, the protrusions 9 and 10 are provided at two locations across the center line XX in the disk radial direction. More specifically, a line connecting the outer facing surfaces 7B1 and 7C1 of the respective ear portions 7B and 7C is defined as an outer line YY, and a line connecting the inner facing surfaces 7B2 and 7C2 of the respective ear portions 7B and 7C is defined as an inner line Z. Assuming −Z, the protrusions 9 and 10 are arranged on the outer side in the disc radial direction with respect to the central portion in the disc radial direction (center line XX) with respect to the lines YY and ZZ. That is, the protrusion 9 (10) on the outer side in the disk radial direction of the pair of protrusions 9 (10) is disposed on the outer side in the disk radial direction with respect to the outer line Y-Y. The projection 9 (10) on the inner side in the direction is arranged on the inner side in the disc radial direction with respect to the inner line ZZ.

  In this case, when the separation dimension in the disk radial direction of the pair of protrusions 9 (10) is H1, and the separation dimension H2 between the outer facing surfaces 7B1, 7C1 and the inner facing surfaces 7B2, 7C2, the spacing dimension H1 is larger than the spacing dimension H2. Is larger (H1> H2). As will be described later, as the return spring 14 is fixed to the projection 9 on one side (turn-in side) of the return spring 14, the fixed portion is positioned in the disk radial direction from the lines YY and ZZ. It is arranged on the outer side in the disk radial direction with respect to the central portion (center line XX).

  The inner side and outer side friction pads 6 are detachably attached shim plates 11 and 12 for preventing noise from being located on the back surface 7D side of the back plate 7. The outer side shim plate 11 is disposed between the outer leg portion 5C of the caliper 5 and the back plate 7, and prevents the two from coming into direct contact with each other, thereby suppressing the occurrence of so-called brake squealing between the two. Is. On the other hand, the inner shim plate 12 is disposed between the piston 5E and the back plate 7 inserted into the inner leg portion 5A of the caliper 5, and prevents both of them from coming into direct contact with each other. It suppresses the occurrence of brake noise.

  Each of these shim plates 11 and 12 is configured as a laminated shim formed by superimposing, for example, a metal shim plate and an elastic shim plate. As shown in FIG. 6, the outer side shim plate 11 is positioned on the outer side in the disk radial direction and is formed with three outer claw portions 11A bent in a substantially L shape and on the inner side in the disk radial direction. And four inner claw portions 11B that are bent in a substantially L shape. In the outer shim plate 11, a pair of pieces 11C are formed by cutting and raising at a position corresponding to the claw portion 5C1 at the center of the caliper 5 so as to sandwich the claw portion 5C1. The outer side shim plate 11 is positioned in the circumferential direction of the disk by the abutment between the respective sections 11C and the central claw portion 5C1.

  A pad spring 13 is attached to each arm 2 </ b> A of the attachment member 2. These pad springs 13 elastically support the friction pads 6 on the inner side and the outer side, respectively, and smooth the sliding displacement of each friction pad 6. A metal such as a stainless steel plate having spring properties. It is formed by bending (press molding) a manufactured plate material. In other words, the pad spring 13 is attached to the pad guide 3 of the attachment member 2, and the ears 7B and 7C of the friction pad 6 slide and urge the friction pad 6 outward in the disk radial direction. It is.

  For this purpose, the pad spring 13 includes a pair of guide plate portions 13A, a connecting plate portion 13B, a radial biasing plate portion 13C, and a contact plate portion 13D. The pair of guide plate portions 13 </ b> A is formed by being bent into a shape along the pad guide 3 so as to fit in each pad guide 3 of the mounting member 2, and is separated from the inner side and the outer side of the disk 1. Is formed.

  The connecting plate portion 13B is formed to extend in the axial direction in such a manner as to straddle the outer peripheral side of the disc 1 so as to integrally connect the guide plate portions 13A on the inner side and the outer side of the disc 1. The radial urging plate portion 13C is integrally formed at the inner side in the disk radial direction of each guide plate portion 13A. The abutment plate portion 13D is provided on each of the guide plate portions 13A on the outer side in the disc axial direction (the portion opposite to the disc 1), and bends approximately 90 degrees from each guide plate portion 13A in the circumferential direction of the disc. It is integrally formed to extend.

  Each guide plate portion 13A of the pad spring 13 is fitted in and attached to each pad guide 3 of the mounting member 2, and the back plate 7 of the friction pad 6 is attached to the disk axial direction via the convex ear portions 7B and 7C. It has a function to guide to. Each radial urging plate portion 13C extends from the inner portion of the guide plate portion 13A in the radial direction of the disc to the outer side in the disc axial direction (in the direction away from the disc 1), changes its direction into a substantially 360 degree arc, It extends to the inner side in the disk radial direction of the ears 7B and 7C of the friction pad 6 (back plate 7).

  Each radial urging plate portion 13 </ b> C elastically contacts the ear portions 7 </ b> B and 7 </ b> C of each friction pad 6 (back plate 7) in each pad guide 3 of the mounting member 2, and the back plate 7 of each friction pad 6. Is biased toward the outside in the disk radial direction. Thereby, the ear | edge parts 7B and 7C of each friction pad 6 contact | abut to the outer-diameter side board part 13A1 of each guide plate part 13A. Accordingly, the inner facing surfaces 7B2 and 7C2 of the ear portions 7B and 7C in the radial direction of the disk are contact surfaces that slidably contact the respective radial biasing plate portions 13C. 7C and 7C1 on the outer side in the radial direction of the disk in the radial direction are contact surfaces that are slidably in contact with the outer diameter side plate portion 13A1 of each guide plate portion 13A. With such a configuration, it is possible to smoothly guide the friction pad 6 along the guide plate portion 13 </ b> A in the disk axial direction during braking operation while suppressing rattling of each friction pad 6.

  As shown in FIG. 5, the contact plate portion 13 </ b> D of the pad spring 13 serves as a receiving seat surface on which a distal end side (contact portion 14 </ b> C) of a return spring 14 to be described later contacts in an elastically deformed state. In the case of the present embodiment, as shown in FIG. 2, the contact plate portion 13D is provided on both the pad springs 13 on the turn-in side and the turn-out side. However, the configuration is not limited thereto, and the contact plate portion 13D may be provided only on the pad spring 13 on the turn-in side, which is the side where the return spring 14 is provided. In other words, the contact-side plate portion 13D can be omitted from the pad spring 13 on the delivery side, which is the side where the return spring 14 is not provided. However, from the viewpoint of sharing parts and facilitating assembly work of the pad spring 13 on the turn-in side and the turn-out side, the pad spring 13 provided with the contact plate portion 13D as in the present embodiment is turned around. It is preferable to adopt a configuration that is incorporated in both the side and the outlet side.

  Next, the return spring 14 that urges the friction pad 6 in the return direction away from the disk 1 will be described.

  That is, the return spring 14 is formed by bending (press molding) a metal plate material such as a stainless steel plate having spring properties, and the proximal end side is fixed to the friction pad 6 and the distal end side is attached to the attachment member 2. Opposed to the side. The return spring 14 is assembled between the friction pad 6 and the mounting member 2 in a state where it is elastically deformed as shown by a solid line from a free state shown by a two-dot chain line in FIG. It is energized in a direction away from 1.

  The return spring 14 is a side edge (ear part 7B) that becomes the disk entry side when the vehicle moves forward, among the side edges (in the vicinity of the ear parts 7B and 7C) of the back plate 7 constituting the friction pad 6 on the inner side and the outer side. Near). The inner return spring 14 (see FIG. 1) and the outer return spring 14 have the same configuration.

  The return spring 14 is configured to have a plurality of, more specifically, two places to be fixed to the friction pad 6 on the base end side. For this purpose, the return spring 14 is fixed to the friction pad 6 and extends from the friction pad 6 outward in the disk axial direction (in a direction away from the disk 1), and a pair of fixed leg parts 14A. The distal end side is connected and extended from the connecting portion to the disk rotation direction extension portion 14B, and the distal end side of the extended portion 14B is bent toward the disc 1 and the distal end side is bent so as to be slightly warped. A substantially arcuate or substantially U-shaped contact portion 14C is used.

  Here, each fixed leg portion 14A constitutes the proximal end side of the return spring 14, and includes a fixed plate 14A1 that contacts the back surface 7D of the back plate 7, and a leg plate 14A2 that extends from the fixed plate 14A1 in the disk axial direction. have. A caulking hole 14A3 for caulking and coupling to the protrusion 9 is provided at the central portion of the fixing plate 14A1. That is, the return spring 14 is configured to be fixed to the friction pad 6 (back plate 7) by caulking the caulking hole 14A3 of the fixing plate 14A1 to the protrusion 9.

  On the other hand, the extending portion 14B has a tapered shape in which the width dimension gradually decreases from the proximal end side to which the fixed leg portion 14A is connected to the distal end side (abutting portion 14C side). The contact portion 14 </ b> C constitutes the distal end side of the return spring 14, and the curved portion contacts or slides on the contact plate portion 13 </ b> D of the pad spring 13. The return spring 14 is in an elastically deformed state indicated by a solid line in FIG. 5, and the contact portion 14 </ b> C contacts or slides on the contact plate portion 13 </ b> D, thereby separating the friction pad 6 (back plate 7) from the disk 1. For example, when the brake operation of the vehicle is released, the friction pad 6 is stably returned toward the initial position (standby position). In the present embodiment, the number of the extending portions 14B is one. However, the present invention is not limited to this. For example, the number of extending portions is two as shown by the dotted line in FIG. You may make it contact | abut to contact-plate part 13D, and you may make it be three or more extension parts.

  Here, the return spring 14 is fixed to the friction pad 6 (back plate 7) by caulking and connecting a pair of fixed leg portions 14A on the base end side to the protrusions 9 of the friction pad 6. In this case, the return spring 14 is provided with two fixed leg portions 14A, which are fixed portions, straddling a center line XX connecting the central portions in the disk radial direction of the respective ear portions 7B and 7C. That is, the return spring 14 is fixed at intervals in the disk radial direction at two positions where the base end side crosses the center line XX.

  More specifically, the fixed leg portion 14A (caulking hole 14A3) of the return spring 14 is opposed to the pad guide 3 at the facing surfaces of the ear portions 7B and 7C, that is, the outer facing surfaces 7B1 and 7C1 and the inner facing surfaces 7B2 and 7C2. Are arranged on the outer side in the disc radial direction with respect to the central portion in the disc radial direction (center line XX) than the lines YY and ZZ connecting the two. That is, of the pair of fixed legs 14A, the fixed leg 14A (the caulking hole 14A3) on the outer side in the disk radial direction is fixed to the outer side in the disk radial direction with respect to the outer line Y-Y. Among them, the fixed leg portion 14A (the caulking hole 14A3) on the inner side in the disk radial direction is fixed to the inner side in the disk radial direction from the inner line ZZ. Thereby, the friction pad 6 can be separated from the disk 1 in a stable posture, the inclination of the friction pad 6 with respect to the pressed surface of the disk 1 can be suppressed, and consequently the drag of the friction pad 6 can be suppressed. Can do.

  The disc brake according to the present embodiment has the above-described configuration, and the operation thereof will be described next.

  First, when braking the vehicle, the brake fluid pressure is supplied to the cylinder 5D of the caliper 5 so that the piston 5E is slid toward the disk 1 so that the inner friction pad 6 is placed on one side of the disk 1. Press. At this time, since the caliper 5 receives a pressing reaction force from the disk 1, the entire caliper 5 is slid to the inner side with respect to the arm portion 2A of the mounting member 2, and the outer leg portion 5C is a friction pad on the outer side. 6 is pressed against the other side of the disk 1.

  As a result, the inner and outer friction pads 6 can hold the disk 1 rotating in the direction indicated by the arrow A in FIG. 2 (when the vehicle moves forward) from both sides in the axial direction. The braking force can be applied to the disk 1. When the brake operation is released, the hydraulic pressure in the cylinder 5D decreases, so that the inner and outer friction pads 6 are separated from the disk 1 and return to the non-braking state again. At this time, the inner and outer friction pads 6 are returned to the return position (initial position, standby position) separated from the disk 1 by the return spring 14.

  By the way, according to the prior art, the fixed position of the return spring with respect to the friction pad is one. In sliding the friction pad, the friction pad is separated from the disk due to the difference with the change of the friction coefficient with time of the contact surface between the friction pad fitting portion and the pad spring in the radial direction of the disk. In the process, the friction pad may be inclined with respect to the pressed surface of the disk. In this case, since the return spring is fixed at one location, the tilt of the friction pad may not be suppressed. In another aspect, the fixed portion of the return spring with respect to the friction pad is configured such that the sliding resistance on the two radially opposing surfaces of the disk in which the fitting portion (ear portion) of the friction pad slides with respect to the pad spring. Considering the sliding center as the center of force, these are set to be the same in the disk radial direction. The sliding center may move (fluctuate) in the disk radial direction due to a difference due to a change in the friction coefficient with time of the two disk radial facing surfaces. In other words, the friction coefficient of the contact surface where the inner facing surface in the radial direction of the disk of the fitting portion (ear portion) of the friction pad contacts the radial biasing plate portion is defined as the inner friction coefficient, and the friction pad is fitted. If the friction coefficient between the outer surface facing the disk radial direction of the disk portion (ear part) and the contact surface with which the outer diameter side plate portion of the guide plate portion contacts is the outer friction coefficient, the sliding due to the difference in both friction coefficients The moving center may move (fluctuate) in the disk radial direction. In such a case, the friction pad may be inclined with respect to the pressed surface of the disk in the process of separating the friction pad from the disk with the offset between the sliding center and the fixed portion. In this case, the sliding resistance increases between the fitting portion (ear portion) of the friction pad and the pad guide (pad spring) of the mounting member, and the separation of the friction pad from the disk by the return spring becomes insufficient. There is a risk that drag cannot be fully controlled.

  On the other hand, according to the present embodiment, there are two fixing points on the base end side of the return spring 14 with respect to the friction pad 6 at intervals in the disk radial direction. For this reason, since the return spring 14 supports the friction pad 6 at two points, the inclination of the friction pad 6 with respect to the pressed surface of the disk 1 is suppressed by the action of the return spring 14 trying to level the fixed portions. It becomes possible. From another viewpoint, the sliding center C of the friction pad 6 shown in FIG. 4 and FIG. 6 is the secular friction coefficient of each contact surface between the ear portions 7B and 7C of the friction pad 6 and the pad spring 13. Even if the friction pad 6 moves in the radial direction due to a difference due to the change, the friction pad 6 can be prevented from being inclined with respect to the pressed surface of the disk 1 when the friction pad 6 is separated from the disk 1. That is, by providing a plurality of fixing points on the base end side of the return spring 14, the offset between the sliding center C and the fixing point can be reduced, and the friction pad 6 is separated from the disk 1 substantially in parallel. (Return). Thereby, the sliding between the ear | edge parts 7B and 7C of the friction pad 6 and the pad guide 3 (guide plate part 13A of the pad spring 13) of the attachment member 2 produced by the inclination of the friction pad 6 with respect to the to-be-pressed surface of the disk 1 is carried out. An increase in dynamic resistance can be suppressed. As a result, the friction pad 6 can be separated from the disk 1 in a stable posture, and dragging of the friction pad 6 can be suppressed.

  According to the present embodiment, the proximal end side of the return spring 14 is fixed at two locations across the center line XX connecting the central portions in the disk radial direction of the respective ear portions 7B and 7C. These fixed positions can be spaced apart in the disk radial direction. Thereby, even if the sliding center C of the friction pad 6 fluctuates in the disk radial direction, the sliding center C can be positioned between two fixed positions on the proximal end side of the return spring 14. As a result, the friction pad 6 can be stably separated (returned) while being parallel to the disk 1, and dragging of the friction pad 6 can be suppressed at a higher level.

  According to the present embodiment, two fixing positions (caulking holes 14A3) on the proximal end side of the return spring 14 are connected to the outer facing surfaces 7B1, 7C1 and the inner facing surfaces 7B2, 7C2 of the respective ear portions 7B, 7C. It is arranged on the outer side in the disc radial direction with respect to the central portion in the disc radial direction (center line XX) with respect to the lines YY and ZZ. For this reason, the space | interval (separation dimension H1) regarding the disk radial direction of the two fixed positions (caulking hole 14A3) of the return spring 14 can be enlarged. As a result, it is possible to ensure a large allowable fluctuation amount in the disk radial direction of the sliding center C of the friction pad 6. For this reason, dragging of the friction pad 6 can also be suppressed from this surface.

  Next, FIG. 8 and FIG. 9 show a second embodiment of the present invention. The feature of the present embodiment is that the two fixed positions on the proximal end side of the return spring are located on the inner side in the disk radial direction with respect to the central part in the disk radial direction from the line connecting the opposing surfaces of the respective fitting portions with respect to the pad guide. It is in the arrangement. In the present embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and the description thereof is omitted.

  The back plate 7 of the friction pad 6 is provided with a pair of protrusions 21 located in the vicinity of the ear part 7B on the entry side, and provided with a pair of protrusions 22 in the vicinity of the ear part 7C on the return side. It has been. Each of these protrusions 21 and 22 is provided so as to protrude toward the back surface 7D side of the back plate 7 in the same manner as the protrusions 9 and 10 of the first embodiment described above. (Oval, oval). One of the projections 21 and 22 located on the side of the disk 1 is for fixing a later-described return spring 23 to the back plate 7. That is, the caulking hole 23A3 of the return spring 23 is engaged with (engaged by caulking) one of the projections 21 (the turn-in side).

  Here, the protrusions 21 and 22 are provided at two locations across the center line XX connecting the center portions in the disk radial direction of the ear portions 7B and 7C in the disk radial direction. More specifically, the protrusions 21 and 22 are more discreet than the outer line YY connecting the outer facing surfaces 7B1 and 7C1 of the ear portions 7B and 7C and the inner line ZZ connecting the inner facing surfaces 7B2 and 7C2. It is arranged on the inner side in the radial direction of the disc with respect to the central portion in the radial direction (center line XX). That is, out of the pair of protrusions 21 (22), the protrusion 21 (22) on the outer side in the disk radial direction is disposed on the inner side in the disk radial direction with respect to the outer line Y-Y. The protrusion 21 (22) on the inner side in the direction is disposed on the outer side in the disk radial direction with respect to the inner line ZZ.

  In this case, when the separation dimension in the disk radial direction of the pair of projections 21 (22) is H3 and the separation dimension H2 between the outer facing surfaces 7B1 and 7C1 and the inner facing surfaces 7B2 and 7C2, the spacing dimension H3 is the spacing dimension. It is smaller than H2 (H3 <H2). As will be described later, the return spring 23 has its proximal end fixed to the one (turn-in side) protrusion 21, and the fixing location is more in the disk radial direction than the lines YY and ZZ. It is arranged on the inner side in the disk radial direction with respect to the central portion (center line XX).

  The return spring 23 fixed to the one (turn-in side) protrusion 21 urges the friction pad 6 in the return direction away from the disk 1 in the same manner as the return spring 14 of the first embodiment described above. It is. Here, similarly to the return spring 14 of the first embodiment, the return spring 23 of the present embodiment is roughly constituted by a pair of fixed leg portions 23A, an extension portion 23B, and a contact portion 23C. ing. Each fixed leg 23A constituting the base end side of the return spring 23 has a fixed plate 23A1 that contacts the back surface 7D of the back plate 7 and a leg plate 23A2 extending from the fixed plate 23A1 in the disk axial direction. A caulking hole 23A3 for caulking and coupling to the protrusion 21 is provided in the central portion of 23A1.

  Here, the return spring 23 is fixed to the friction pad 6 (back plate 7) by caulking and joining a pair of fixed leg portions 23 </ b> A on the base end side to the protrusions 21 of the friction pad 6. In this case, the return spring 23 is provided with two fixed leg portions 23A, which are fixed portions, straddling a center line XX connecting the central portions in the disk radial direction of the respective ear portions 7B and 7C. That is, the return spring 23 is fixed at two positions where the base end side crosses the center line XX.

  More specifically, the fixing leg 23A (caulking hole 23A3) of the return spring 23 is opposed to the ears 7B and 7C with respect to the pad guide 3, that is, the outer facing surfaces 7B1 and 7C1 and the inner facing surfaces 7B2 and 7C2. Are arranged on the inner side in the disc radial direction with respect to the central portion in the disc radial direction (center line XX) than the lines YY and ZZ connecting the two. That is, out of the pair of fixed legs 23A, the fixed leg 23A (the caulking hole 23A3) on the outer side in the disk radial direction is fixed to the inner side in the disk radial direction with respect to the outer line YY. Among them, the fixed leg 23A (caulking hole 23A3) on the inner side in the disk radial direction is fixed to the outer side in the disk radial direction from the inner line ZZ.

  Also in the second embodiment configured as described above, substantially the same operational effects as those of the first embodiment described above can be obtained. In particular, in the second embodiment, the two fixing positions (caulking holes 23A3) on the proximal end side of the return spring 23 are set to the outer facing surfaces 7B1, 7C1 and inner facing surfaces 7B2, 7C2 of the respective ear portions 7B, 7C. Are arranged on the inner side in the disc radial direction with respect to the central portion in the disc radial direction (center line XX) than the lines YY and ZZ connecting the two. For this reason, the space | interval (separation dimension H3) regarding the disk radial direction of the two fixing positions (caulking hole 23A3) of the return spring 23 can be made small. Thereby, the base end side of the return spring 23 can be configured in a small size, and the degree of freedom of the space around the base end side of the return spring 23 can be improved. Specifically, for example, the claw portion 5C1 (see FIG. 2) on the side of the caliper 5 adjacent to the proximal end side of the return spring 23 can be enlarged, and the rigidity of the caliper 5 can be ensured accordingly. Improvement of pedal feeling and suppression of brake noise can be achieved.

  In each of the above-described embodiments, the case where the return springs 14 and 23 are fixed to the friction pad 6 is described as an example. However, the present invention is not limited to this, and for example, the number of places where the return spring is fixed to the friction pad may be three or more. For example, when the number of fixing points of the return springs to the friction pad is three, the fixing points of the return springs are 2 on the line connecting the central portions in the disk radial direction of the respective fitting portions and straddling the connecting line. It can be set as the structure provided in total three places with a place.

  In each of the above-described embodiments, the case where the return springs 14 and 23 are provided only on the turn-in side of the disk 1 has been described as an example. However, the present invention is not limited to this, and for example, return springs may be provided on both the turn-in side and the turn-out side of the disk.

  In each of the above-described embodiments, the return springs 14 and 23 are caulked and fixed to the friction pad 6. However, the present invention is not limited to this. For example, the return spring is fixed by clamping the return spring to the back plate of the friction pad. The fixing method can be designed as appropriate.

  In each of the above-described embodiments, a case where a so-called integrated pad spring 13 having the guide plate portions 13A, the radial urging plate portions 13C and the like on the inner side and the outer side of the disk 1 is used as an example. explained. However, the present invention is not limited to this. For example, two pad springs having a shape in which the pad springs are separated on the inner side and the outer side of the disc may be arranged on the inner side and the outer side of the disc, respectively. .

  In each of the above-described embodiments, the case where the two pistons 5E are provided on the inner leg portion 5A of the caliper 5 has been described as an example. However, the present invention is not limited to this. For example, one piston may be provided on the inner leg of the caliper, or three or more pistons may be provided on the inner leg of the caliper.

  According to the above embodiment, drag of the friction pad can be suppressed.

  That is, according to the embodiment, since there are a plurality of fixing points on the base end side of the return spring with respect to the friction pad at intervals in the disk radial direction, when the friction pad is separated from the disk, the friction pad Inclination with respect to the pressed surface of the disk can be suppressed. That is, by providing a plurality of fixing points on the base end side of the return spring, the friction pad can be separated (returned) substantially parallel to the disk by the action of the return spring trying to level the fixing points. it can. Thereby, the increase in the sliding resistance between the fitting part of a friction pad and an attachment member can be suppressed. As a result, the friction pad can be stably separated from the disk, and dragging of the friction pad can be suppressed.

  According to the embodiment, since the proximal end side of the return spring is fixed at two locations straddling the line connecting the central portion in the disc radial direction of the fitting portion, the fixing positions of these two locations are set in the disc radial direction. They can be spaced apart. Thereby, even if the sliding center of the friction pad fluctuates in the disk radial direction, the sliding center can be positioned between the two fixed positions on the proximal end side of the return spring. As a result, the friction pad can be separated (returned) in a stable posture while being substantially parallel to the disk, and dragging of the friction pad can be suppressed at a higher level.

  According to the embodiment, the two fixed positions on the proximal end side of the return spring are arranged on the outer side in the disk radial direction with respect to the central part in the disk radial direction with respect to the line connecting the opposing surfaces of the fitting portions with respect to the pad guide. As a result, the interval in the disk radial direction between the two fixed positions of the return spring can be increased. As a result, a large allowable fluctuation amount in the disk radial direction at the sliding center of the friction pad can be secured.

  According to the embodiment, the two fixed positions on the proximal end side of the return spring are arranged on the inner side in the disk radial direction with respect to the central part in the disk radial direction with respect to the line connecting the opposing surfaces of the fitting portions with respect to the pad guide. Therefore, the interval in the disk radial direction between the two fixed positions of the return spring can be reduced. Thereby, the base end side of a return spring can be comprised small, and the freedom degree of the space around the base end side of a return spring can be improved. Specifically, for example, the caliper of the caliper that is close to the proximal end side of the return spring can be enlarged, and the caliper can be secured to that extent, thereby improving pedal feeling and suppressing brake noise. Can do.

DESCRIPTION OF SYMBOLS 1 Disc 2 Mounting member 3 Pad guide 5 Caliper 6 Friction pad 7B, 7C Ear | edge part (fitting part)
13 Pad spring 14, 23 Return spring 14A, 23A Fixed leg

Claims (3)

An attachment member having a pad guide that is attached to a non-rotating portion of the vehicle across the disc and formed as a concave groove that is recessed in the rotational direction of the disc;
A caliper provided slidably on the mounting member;
Fitting pads that are slidably fitted to the pad guides are formed to extend at both ends in the circumferential direction of the disc, and friction pads that are pressed against the disc by the calipers;
A pad spring attached to the pad guide for sliding the fitting portion of the friction pad and urging the friction pad outward in the radial direction of the disk;
In a disc brake comprising: a return spring fixed to the friction pad and having a distal end opposed to the attachment member side and biasing the friction pad in a return direction away from the disc;
The return spring is branched into a plurality on the proximal end side,
Disc brake, characterized in that it had contact to the branched proximally having a plurality of fixed positions to the friction pad at intervals in the disk radial direction.   2. The disc brake according to claim 1, wherein two fixing portions of the return spring are provided across a line connecting a central portion in the disc radial direction of each fitting portion.   3. The fixing portion of the return spring is disposed on the outer side in the disk radial direction with respect to a central portion in the disk radial direction with respect to a line connecting the opposing surfaces of the fitting portions with respect to the pad guide. Disc brake as described in.

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